How is cataract caused? What is done to restore the vision of a person suffering from cataract?
Important Questions on Human Eye and the Colorful World
(b) What is the other term used for this defect?
(c) List two causes for its development.
(d) How can it be corrected? Draw labelled ray diagrams to support your answer.
A student finds the writing on a blackboard as blurred and unclear when sitting on the last desk in a classroom. He, however, sees it clearly when sitting on the front desk at an approximate distance of from the blackboard. Draw labelled ray diagrams to illustrate the formation of the image of the blackboard writing by his eye lens when he is used at the (i) last desk; (ii) front desk.
A student finds the writing on a blackboard as blurred and unclear when sitting on the last desk in a classroom. He, however, sees it clearly when sitting on the front desk at an approximate distance of from the blackboard. Name the kind of lens that would help him see clearly even when he is seated at the last desk. Draw a ray diagram to illustrate how this lens helps him to see clearly.
(b) What is the other term used for this defect?
(c) List two causes for its development.
(d) How can it be corrected? Draw labelled ray diagrams to support your answer.
